diff --git a/Gemfile b/Gemfile
index d6e5cac..a0a61a8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -46,7 +46,7 @@ gem "figaro"
 
 # Use sqlite3 as the database for Active Record
 # Use Puma as the app server
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index a1489ff..3e29563 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -177,7 +177,8 @@ GEM
     pry-stack_explorer (0.4.9.2)
       binding_of_caller (>= 0.7)
       pry (>= 0.9.11)
-    puma (3.8.2)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     qiniu (6.9.1)
       mime-types (~> 3.1)
       rest-client (~> 2.0)
@@ -337,7 +338,7 @@ DEPENDENCIES
   pg (~> 0.21)
   pry-byebug
   pry-stack_explorer
-  puma (~> 3.0)
+  puma (~> 4.3)
   qiniu (>= 6.9.0)
   rails (~> 5.0.2)
   rails-erd